Quote Originally Posted by mudski View Post
The 2.8's wont go into limp mode due to the EGR blocked. So drilling a hole will be pointless. But if it is leaking at the plate, check the surfaces to make sure they are flat, gasket goo as mentioned may help. The RD28 EGR valve is vacuum controlled, not electronic. So disconnecting the battery may be pointless. But its worth a shot.

And to add. The RD's have a pressure relief valve on the intake manifold, because you have blocked the EGR, boost pressures will be higher so all that extra pressure may just be going out the relief valve. I have heard of people removing this valve and blocking the port on the manifold. But you will also need to install a manual boost control valve then to control your boost pressure.
Having said that I feel this may be your issue.
Augh. Good pick up lol..
I gotta stop posting at 3am...

But good advice on the relief valve. A recent member had a faulty one and it was just by passing when on boost..
I'd say check what mark has suggested..
And a boost gauge and controller..